linux-kernel - Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for

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Message-ID: <560BBA12.5090102@cn.fujitsu.com>
Date:	Wed, 30 Sep 2015 18:31:46 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, <zhongjiang@...wei.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	<tangchen@...fujitsu.com>
Subject: Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()


Seems OK to me.

Thanks.

On 09/30/2015 05:33 PM, Xishi Qiu wrote:
> If user set "movablecore=xx" to a large number, corepages will overflow,
> this patch fix the problem.
>
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>   mm/page_alloc.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 48aaf7b..af3c9bd 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5668,6 +5668,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>   		 */
>   		required_movablecore =
>   			roundup(required_movablecore, MAX_ORDER_NR_PAGES);
> +		required_movablecore = min(totalpages, required_movablecore);
>   		corepages = totalpages - required_movablecore;
>   
>   		required_kernelcore = max(required_kernelcore, corepages);

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